Nature “Broken Tail: A Tiger’s Last Journey” at 7 pm
Irish cameraman Colin Stafford-Johnson spent almost 600 days filming Broken Tail and his family for some of the finest tiger documentaries ever made. Broken Tail was the most charismatic tiger cub ever seen in Ranthambore, one of India’s best protected tiger reserves. But suddenly and without warning Broken Tail abandoned his sanctuary and went on the run, moving through farmland and scrub until he was killed by a train nearly 200 miles from his home. To track Broken Tail’s incredible journey, Colin and his soundman, Salim, retrace the tiger’s path and piece together the cub’s last days – and through his story reveal the fate of the few surviving tigers in India.

NOVA “Doomsday Volcanoes” at 8 pm
The eruption of Iceland’s Eyjafjallajokull volcano in 2010 turned much of the northern hemisphere into an ash-strewn no-fly zone. But Eyjafjallajokull was just the start. Katla, an Icelandic volcano 10 times bigger, has begun to swell and grumble. Two more giants, Hekla and Laki, could erupt without warning. Iceland is a ticking time bomb: When it blows, the consequences will be global. Meet scientists trying to understand those consequences – for air travel and for the global food supply and Earth’s climate. Could we be plunged into years of cold and famine? What can we do to prepare for the coming disaster?

Life On Fire “Icelandic Volcanoes” at 9 pm
The 2010 eruption of the Eyjafjallajokull volcano in Iceland provoked economic chaos by paralyzing a major air traffic network for days. This eruption, however, was mild. Much more powerful volcanoes in Iceland are ready to wake up. Through spectacular aerial footage of this country, which is an accumulation of lava and ash, a maze of craters and faults, the episode tries to discern which volcano could wake up next and what the consequences of a major eruption are likely to be. Europe has come to realize that a colossal power sleeps beneath Iceland, while Icelanders for centuries have learned to live amongst their volcanoes.